Connection Failure: <-7> Connection Error | Incorrect Port | Enter a different port number and test again. Common ports include 465, 587 and 25. |
Connection Failure: <-10> E-mail Server Not Set up. |  Validate CA is turned On when it should be turned Off or the opposite way. Username entered incorrectly.
| Try the opposing setting and test again. Try both the full name; e.g., test@gmail.com, and then just the username; e.g., test, and test again.
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Connection Failure: <-11> Cannot resolve server address. | Incorrect SMTP Server Address Network communication problem Printer communication problem
| Enter the SMTP server address, and test again. Contact your internet service provider to identify a problem with the wide area network (WAN). Can you access the web? Test network-printer communication by opening the Embedded Web Server and printing a page or scanning a document to a PC.
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Connection Failure: <-19> | Incorrect Port or SSL/TLS setting | Contact your ESP and verify SSL/TLS and Port combination, and test again. |
Connection Failure: <-22> SSL certificate validity has a future date. | The configured Date and Time are inaccurate. | Update and set the correct date and time on the device. In the control panel, go to Settings > Device > Preferences > Date and Time > Configure. |
Connection Failure: <-52> Error sending to an email connection failure -52 self time certificate. | Validate CA has been checked. | Uncheck the "Validate CA" tickbox. Access printer EWS > go to Settings > E-mail/FTP Settings > E-mail Settings > Setup E-mail Server > clear Validate CA |
Connection Failure <504> | SMTP Server Authentication set to "NTLM" | Unrecognized Authentication Type. Change Authentication to applicable Plain/Login or None. |
Connection Failure: <530> | Enable SSL/TLSis turned Off when it's actually required. SMTP Server Authentication is set to No Authentication Required "None".
| Set to Negotiate or Required and test again. Set Authentication to applicable setting and test again. (Plain/Login, or NTLM.)
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Authorization failed <534> | N.A. | Enable your Gmail account access for less secure apps. To do so: Go to https://support.google.com/accounts/. Click Account security > Suspicious activity. Click Allowing less secure apps to access your account. Under Access your account, click Allow less secure apps. Select Turn On.
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Connection Failure <535> | Username and Password not accepted. | Change username and Password and test again. Again, some ESPs require full email address (hello@yahoo.com) and others require only the beginning Userid (hello) portion of the email address. Passwords are sensitive to spelling, capitalization, and the use of symbols and characters. |